The age beginning with the first space travel; from 1957 to the present WordNet 3.0 & Open English WordNet

The Space Age is a period encompassing the activities related to the Space Race, space exploration, space technology, and the cultural developments influenced by these events, beginning with the launch of Sputnik 1 on October 4, 1957, and continuing to the present. Wikipedia

Historical period started in 1957 Wikidata

The period from the about the time of the launch of Sputnik in 1957 to the present day, during which man ventured into space. Wiktionary